This is helpful, thank you. To clarify, my hotel is in Soho in London, not one of the airport hotels, which is my primary interest for being able to check it all the way through back to the USA from Dublin, so I don't have to haul it around with me on the tube.

And the two tickets are as such:

Ticket 1:
Nov 21: XNA-DFW-LHR-DUB (in business on the AA 77w TATL)
Dec 1: DUB-LHR overnight in London
Dec 2: LHR-DFW-XNA (also in the AA 77w TATL)

Ticket 2:
Nov 25: DUB-LHR-DXB-SYD (QF F on LHR-SYD)
Nov 30: SYD-DXB-LHR-DUB (also QF F, and that last flight is the one where I turn around in Dublin to start the second half of ticket 1).

As mentioned, most.uneconomical.mileage.run.ever!

But it's gonna be a hell of a lot of fun!